Digital Commons Network^™

Contribution Of G4 Structure To Alzheimer’S Disease And Tau Pathology, Lena Michaela Kallweit

Electronic Theses and Dissertations

The occurrence of Alzheimer’s Disease (AD) is rapidly increasing as our global population ages. With the majority of therapeutic drugs in the last couple of decades failing clinical trials, new molecular targets are needed to combat the expected influx of new AD cases. AD pathogenesis is associated with abnormal protein aggregation, characterized in part by intracellular accumulation of hyperphosphorylated tau (p-tau) in neurofibrillary tangles (NFTs). RNA has been identified as a major non-proteinaceous component of NFTs and has been implicated as an active cofactor in tau aggregation and spread. Recent work has shown that aggregates from AD brains contain almost …

Exploring The Personal Management Interview Program As A Burnout Prevention Strategy In Policing: A Qualitative Case Study, Lance C. Arnold

Electronic Theses and Dissertations

Police officers in the United States experience severe burnout at rates exceeding other service professions, with approximately 75% experiencing burnout symptoms. Current interventions predominantly focus on individual coping mechanisms rather than addressing organizational and leadership factors contributing to burnout. This qualitative single-case study explored the perceptions and experiences of police leaders and officers concerning the utility of a personal management interview program to foster positive leadership behaviors as a resource-oriented preventive strategy against burnout in a midsize municipal police department in Texas. The study employed semistructured virtual interviews with eight participants: four police leaders and four police officers who had …

A Narrative Study On The Resilience Of Women In Technology Careers, Gina J. Baldridge

Electronic Theses and Dissertations

In spite of the promotion of science, technology, engineering, and mathematics (STEM) education and careers, there is a lack of women entering the STEM workforce and majoring in STEM subjects. Women can experience gender bias and workplace marginalization in STEM careers, but have learned coping strategies that have contributed to their technology career resilience. The purpose of this narrative qualitative study was to explore how women working as individual performers and leaders in technology companies told their career stories of resilience through the perspective of change acceptance, confidence, and communication, three factors in Kumar’s CR8 model of resilience. The model …

Work Environments Matter: The Impacts Of Interpersonal Relationships On Student Affairs Professionals, Lawrence R. Daniel

Electronic Theses and Dissertations

This qualitative study examined how everyday workplace relationships influence engagement, professional identity, and retention among student affairs professionals in higher education. Guided by relational leadership theory, the study explored how leadership is experienced not only through formal position or authority, but also through relational presence, psychological safety, and advocacy. Seventeen student affairs professionals representing diverse institutional types, geographic regions, and career stages participated in in-depth semistructured interviews. Data were analyzed using reflexive thematic analysis and incorporated both in vivo and line-by-line coding to ensure that findings remained grounded in participants’ voices and lived experiences. Nine themes emerged from the analysis. …

Women Working Well: The Experiences Of Black Women Nonprofit Leaders In The Tristate Area, Erika K. Stanley Wesley

Electronic Theses and Dissertations

This qualitative narrative inquiry study examined the lived experiences, challenges, and leadership practices of Black women nonprofit leaders in the northeastern United States. Guided by Black feminist thought and positive leadership theory, the study explored how participants’ identities informed leadership enactment and how positive leadership practices influenced organizational impact and change. Data were collected through semistructured interviews with 11 Black women nonprofit leaders and analyzed using thematic analysis to identify patterns across participant narratives. Findings aligned with four research questions. Participants described unique experiences characterized by identity as power, cultural bridge-building, and the weight of representation. Key challenges included funding …

Intersecting Identities: The Leadership Journeys And Challenges Of Black Women Senior Leaders In Southern U.S. Predominantly White Institutions, Quizanae' Yvonne Cooper

Electronic Theses and Dissertations

This study looked at what Black women in high‑level leadership roles are experiencing at predominantly White institutions in Texas and Florida now that diversity, equity, and inclusion (DEI) policies have been rolled back. Using Black feminist theory and intersectionality as the foundation, the research focused on how race and gender shape their leadership, their decision‑making, and the ways they navigate their careers. Through in‑depth interviews with 10 Black women in executive positions, the study uses a narrative approach to understand their stories. Eight major themes emerged, and many participants explained that losing DEI initiatives created new obstacles, reduced support systems, …

The Influence Of Community Engagement On Educator Job Satisfaction And School Culture In K–5 Schools: A Multicase Study, Hailee Jo Fojtasek

Electronic Theses and Dissertations

This qualitative multicase study examined how school leaders and educators perceived the

influence of community engagement, particularly volunteerism, on campus culture and teacher

job satisfaction in K–5 schools in the North Texas region. Continuous teacher attrition and

weakening campus morale have resulted in increased attention to leadership strategies that

support retention. However, the role community engagement has in supporting educators has

been underexplored. The purpose of this study was to investigate how educators and

administrators experienced and interpreted community engagement efforts on their campus and

how those efforts shaped school culture and teacher job satisfaction. Guided by social capital

theory, …

Exploring The Lived Experiences Of Black Women In Undergraduate Stem Core Expansion Pathways, Lizzie L. Evans Martinez Alvarez

Electronic Theses and Dissertations

The use of social incongruence in the film Hidden Figures, which juxtaposed with STEM education as the most powerful in contrast with Black women as the least powerful, supported the argument for the specific problem of practice to examine the unmet need for socially and ethnically diverse student populations in U.S. STEM higher education and careers. The purpose of this hermeneutic phenomenological research study was to identify and analyze the lived experiences of Black women regarding barriers they perceive in the STEM educational and career decision-making processes, while exploring transformational pathways to STEM academic success. The study specifically analyzed …

Texas Secondary Spanish Teachers’ Perceptions Of Factors Influencing Instructional Self- Efficacy, Satisfaction, And Effectiveness, Tana Verlane Palafox

Electronic Theses and Dissertations

Ongoing shortages of certified world language teachers and declining enrollment in secondary language programs have intensified concerns about teacher burnout, professional isolation, and instructional quality. Research has indicated that collaboration, targeted professional development, and supportive leadership influence teachers’ instructional self-efficacy, job satisfaction, and instructional effectiveness. However, limited research has examined how secondary Spanish teachers in Texas experience these issues. This qualitative collective case study explored how Texas secondary school Spanish teachers perceive the impact of their professional experiences on instructional self-efficacy, job satisfaction, and instructional effectiveness. Grounded in Bandura’s social cognitive theory and Vygotsky’s social constructivism, the study examined how …

Machine Learning For Elderly Behavior And Risk Incident Modeling, Muhammad Tanveer Jan

Electronic Theses and Dissertations

The rapid expansion of the aging population presents critical challenges to healthcare systems, particularly in maintaining independent living, ensuring mobility safety, and optimizing emergency interventions. Traditional monitoring solutions are often fragmented, reactive, and hindered by the scarcity of data regarding rare high-risk events. This dissertation proposes a comprehensive, multi-modal machine learning framework designed to model elderly behavior and predict risk incidents across three critical environments: the home, the vehicle, and the clinical setting.

To address the fundamental challenge of class imbalance in medical and behavioral datasets—where risk events are statistically rare—this research first introduces a dual-phase data augmentation strategy. By …

Advances In Real-Time American Sign Language Recognition System Using Deep Learning Techniques For Enhanced Accessibility, Bader Alsharif

Electronic Theses and Dissertations

Advancements in technology have significantly contributed to the development of innovative tools aimed at improving communication and accessibility for individuals with hearing impairments. This dissertation explores various machine learning and deep learning techniques for recognizing American Sign Language (ASL) gestures, focusing on enhancing accessibility and bridging the communication gap between hearing-impaired and hearing individuals. Traditional machine learning models, such as Random Forest, Support Vector Machines (SVM), and K-Nearest Neighbors (KNN), alongside deep learning architectures like AlexNet, ResNet-50, EfficientNet, ConvNeXt, and VisionTransformer, were investigated for their effectiveness. Experiments conducted on an extensive dataset of 87,000 ASL gesture images revealed exceptional recognition …

Uas Path Planning With Dynamic Rerouting Using A Space-Time Graph, Kimoy Williams

Electronic Theses and Dissertations

UAS systems have emerged as multifaceted technologies with applications across a wide range of sectors. Their ability to access areas that are difficult or unsafe for manned systems has made them invaluable tools in various domains. As a result, UAS have transformed numerous industries, including infrastructure inspection, delivery and logistics, military and defense, as well as precision agriculture and environmental monitoring.

The advancement in UAS technology is fundamentally reliant upon ongoing research efforts in the specialized area of UAS path planning. Optimal flight planning is essential for a UAV to effectively execute its mission’s task safely, effectively, and in congruence …

Leader Rounding For Outcomes To Improve Employee Retention, Laura R. Escobar

Electronic Theses and Dissertations

Intention to leave a nursing staff position, if not addressed, may lead to an increased rate of nursing turnover. High turnover rates can negatively affect staffing patterns, increase organizational costs, and disrupt the continuity of patient care. A quantitative quasi-experimental pre-/posttest design was used to evaluate the impact of the High Reliability Organization Leader Rounding for Outcomes tool to reduce the intent-to-leave scores, as measured by the Turnover Intention Scale (TIS-6), compared to current practice over 12 weeks. Implementation of the tool provided a structured leader rounding process designed to strengthen communication, recognize staff contributions, and proactively identify workplace concerns. …

Longevity, Resilience, And Thriving Of Women In Ministry: A Case Study Of Women In Ministry From A United Pentecostal Holiness Church, Eunice Cheryl Feltus Little

Electronic Theses and Dissertations

Abstract

The problem of ministry attrition caused by burnout is well documented. Research attributes the impact of burnout on the resilience, longevity, and thriving of ministry workers to role-related stress and adversity. High attrition rates throughout religious organizations and a lag in longevity and resilience contribute to a shortage of ministry workers. Some ministry workers leave the vocation because of stress and burnout, yet others persevere. Despite the possible adverse effects, many men and women find a sense of well-being and joy in ministry work. This qualitative distributive case study focused on those who stayed in ministry and the strategies …

Impact Of The Lace Index Scoring Tool On Sepsis Readmissions, Tabitha M. Keaty Sheppard

Electronic Theses and Dissertations

Sepsis is a life-threatening medical emergency that negatively affects patients and healthcare organizations worldwide. Consequently, sepsis survivors are presented with even greater health risks following acute hospitalizations, and the financial implications on healthcare organizations increase with each patient readmission. This quality improvement project studied the impact of the LACE Index Scoring Tool on sepsis readmissions within a single healthcare organization in the southern region of the United States. Per quality metric data, sepsis readmissions have remained a prevalent issue at the project site. The purpose of this doctoral project was to reduce 30-day sepsis readmissions following the implementation of the …

Patient Wait Time And Throughput Interventions In The Cardiology Outpatient Setting, Chioma Ohiri Tawose

Electronic Theses and Dissertations

Healthcare collaboration and patient care require effective communication. Poor communication impacts wait time. Inadequate communication in the outpatient cardiology clinic can lead to disruptive patient throughput, or workflow, and extend patient length of visit. The purpose of this project was to implement a means of communication for clinicians and healthcare assistants to improve patient flow and cut down idleness, ultimately reducing patient wait time. The project established the incorporation of a built-in electronic health record communication notification system, the Event Button, for asynchronous communication between staff. A quantitative quality improvement design was used to conduct this project. Inferential and descriptive …

The Built Environment And Its Effects On Health Outcomes In Metropolitan Miami, Jared Sanchez Hoehing

Electronic Theses and Dissertations

Obesity, depression and social isolation rates are an increasing worry in the United States. As planners, we help shape the built environment, which can influence a person’s health outcomes. To assess the effects the built environment has on health outcomes, this paper looks at the percentage of park space, the population density and the national walk index score, combined with several demographic and socioeconomic variables in the Metropolitan Miami region. The study uses the spatial autoregression results of the variables on each health measurement to determine the connection with each health outcome. Despite initial hypotheses that the built environment leads …

Assessing The Impact Of Local–State Revenue Shares And Property Tax Structure On Effective Farmland Tax Rates: Panel Evidence From Seven Midwestern States, 2009–2022, Imtiaz Amin Chy

Electronic Theses and Dissertations

Property taxes are the primary revenue instrument of local governments in the United States, yet the burdens they impose are distributed unevenly. Farmland, because it cannot be relocated, often absorbs a disproportionate share. This paper examines two related questions: what fiscal factors determine how heavily agricultural land is taxed, and do those tax rates capitalize into farmland asset values? Using an annual panel of Iowa, Illinois, Indiana, Kansas, Minnesota, Nebraska, and Wisconsin from 2009 to 2022, we first document how each state allocates property tax revenue across four major spending categories (education, public welfare, health, and utilities) finding that all …

Managing The Mood: How Managerial Communication Shapes The Experience Of Emotional Labor Among Restaurant Employees, Brynn Olverson

Electronic Theses and Dissertations

Restaurant work is emotionally demanding work for servers and bartenders. Organizational Support Theory (Eisenberger et al., 1986) suggests that employees’ perceptions of their organizations’ support can bolster the negative side effects of such work. However, past instruments used to measure these perceptions do not distinguish between types of emotional experience, nor separate perceptions of emotional support from other forms of support. Likewise, OST notes that supervisors play a key role in influencing perceptions of organizational support, but more work is needed to determine specific communicative behaviors that can increase perceptions of organizational support. The study at hand proposes that managers' …

The Fertilization President: A Rhetorical Analysis Of The United States’ Rebirth Of Pronatalism, Kara Vetch

Electronic Theses and Dissertations

The United States experienced one of the lowest birth rates in decades in 2024 and has been blamed by policymakers for poor economic and societal outcomes. To combat this, President Donald Trump signed an executive order to encourage healthcare insurances to lower the cost of fertility treatments. Policies encouraging more births align with pronatalist ideologies, the belief that higher national birth rates are better for society. Furthermore, Vice President JD Vance and social media influencers, Malcolm and Simone Collins, have built a strong resurgence of pronatalist ideologies through public addresses and interviews long before Trump’s executive order. For an in-depth …

Cyber Security Related To Agricultural Data Encryption Using Edge Computing Devices, Mohammad Ashik Alahe

Electronic Theses and Dissertations

Smart Agriculture increasingly relies on image-based sensing, edge computing, and artificial intelligence to support data-driven decision-making in modern farming systems. While these technologies improve productivity and resource efficiency, they also introduce significant cybersecurity risks, particularly agricultural images transmitted and processed in real-time on resource-constrained edge devices. Unauthorized access, data manipulation, and interception of image data can lead to incorrect agronomic decisions and severe economic consequences. Despite this risk, efficient and practical cybersecurity solutions for real-time agricultural imaging remain limited. This study addresses these challenges by developing and evaluating encryption-based cybersecurity frameworks tailored for real-time agricultural image protection on edge computing …

A Systematic Review: Comparative Analysis Of Healthcare Waste Management Practices In Kenya And In The United States, Esther Nyokabi Gathungu

Electronic Theses and Dissertations

This comparative study used a systematic literature review to explore waste management practices in Kenya and the USA, examining predefined concepts to identify new patterns relevant to sustainable healthcare waste management (HCWM) practices. The study aimed to understand sustainable practices in healthcare waste management and how developing nations such as Kenya can benchmark from practices in developed nations such as the USA. While the study identified challenges in waste management across Kenya and the USA, it also identified sustainable practices that could be adopted across contexts. The study followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines …

The Impact Of Communication Satisfaction On Division I Student Athletes, Gabriella Gnewuch

Electronic Theses and Dissertations

Communication satisfaction is vital for the motivation, retention, and interpersonal success of collegiate student-athletes. While coaches play a pivotal role in the athletic experience, current literature focuses predominantly on head coaches, leaving a significant gap regarding the influence of assistant coaches. This study utilized Confirmation Theory, comprised of the dual dimensions of acceptance and challenge. The study examined how these communication behaviors impact student-athlete satisfaction at the Division I level. A census was conducted among Division I student-athletes at South Dakota State University using the Coach Confirmation Instrument (CCI) and the Student Communication Satisfaction Scale (SCSS). Quantitative results from multiple …

An Integrated Evaluation Of Trace Mineral Status, Regional Variation, And Supplementation Effects On Circulating Mineral And Reproductive Performance In American Plains Bison, Bailey M. Rodriguez

Electronic Theses and Dissertations

The continued expansion of the American Plains Bison (Bison bison) industry has increased the need for science-based nutritional recommendations tailored specifically to the species, due to limited species-specific research. Because trace minerals influence immune function, growth, and reproductive performance, establishing baseline mineral status and evaluating responses to supplementation are critical for advancing bison production and conservation efforts. This thesis integrates two complementary investigations to evaluate trace mineral status in American Plains bison at both regional and herd management levels. First, a herd level comparison evaluated the influence of differing mineral supplementation strategies on circulating mineral concentrations, herd performance, and reproductive …

The Fate And Removal Of E. Coli Across Liquid And Sludge Treatment Stages In An Activated -Sludge Water Resource Recovery Facility, Shrawan Tandukar

Electronic Theses and Dissertations

This study evaluates the fate and removal efficiency of Escherichia coli (E. coli) across both liquid and sludge treatment processes at a full-scale activated sludge water resource recovery facility (WRRF) in Brookings, South Dakota. Understanding pathogen reduction within wastewater treatment systems is critical for protecting public health and ensuring regulatory compliance, particularly in facilities practicing water reuse and biosolids management. Liquid and sludge samples were collected from multiple treatment stages between January and July 2025 and analyzed using the IDEXX Colilert Quanti-Tray 2000 method. This study quantifies E. coli concentrations throughout the treatment train to assess removal performance and identify …

New Era Of Academic Advising: Integration Of Artificial Intelligence Within Academic Advising By, Rachel Elaine Schmitz

Electronic Theses and Dissertations

Academic advising is a critical component of student success, directly impacting institutional retention, GPA, and student autonomy. This thesis explores the transition of this profession into my proposed fifth era characterized by the integration of Artificial Intelligence (AI) as a supportive tool, rather than a replacement, for human connection. Grounded in Peplau’s Interpersonal Relations Theory (IRT), this study examines advisors’ perception of how advanced technology can impact the interpersonal process between students and advisors. A qualitative methodology was used, consisting of seven (N = 7) semi-structured interviews with professional advisors at South Dakota State University. Thematic analysis revealed that AI …

Effect Of Increasing Potency Of Steroidal Implants In Beef Steers At Weaning From Dry-Lot To Finish, Weston Joseph Peschel

Electronic Theses and Dissertations

The receiving phase is a stressful transition period in beef production. Newly weaned cattle are offered low-energy, high-forage diets promoting lean tissue and bone development prior to the finishing phase. Steroidal implants containing trenbolone acetate (TBA) and estradiol benzoate (EB) enhance lean gain. Aggressive early implant exposure has been shown to negatively impact intramuscular fat deposition. This two-part study evaluated the initial and carryover effects of increasing doses of combined TBA and EB weaning implants on growth performance, serum metabolites, and carcass traits. In Exp. 1, newly weaned Charolais × Red Angus crossbred beef steers [n = 240 initially; body …

A Framework For Reliable Domain Ai: Knowledge-Grounded Data And Logic-Graph Reasoning, Yangxiao Bai

Electronic Theses and Dissertations

Large language models (LLMs) perform well on general tasks, yet their deployment in specialized, high-stakes domains such as public health remains unreliable. Models hallucinate facts, combine multi-step evidence incorrectly, and retrieve context that corrupts downstream reasoning. Three root causes underlie these failures: training data that underrepresents rare but critical domain themes, reasoning that is opaque and unverifiable, and evidence use that cannot be re-checked when the evidence changes. This dissertation addresses all three. First, we introduce HDBSCAN_SSA, a coarse-to-fine topic-modeling pipeline that couples density-based clustering with a novel Semantic Seed Aggregation algorithm. Using samples drawn from a larger corpus of …

Effect Of Corn Processing Methods On Growth Performance, Carcass Characteristics, And Gastrointestinal Health In Ruminants Fed Finishing Diets, Reanna Rae Byrnes-Schoen

Electronic Theses and Dissertations

The objective of this work was to evaluate different feed processing techniques and their impacts on growth performance, carcass traits, and gastrointestinal health in ruminant animals fed in confinement during the finishing phase. Two studies were conducted. The first study evaluated the effect of kernel processing high moisture ear corn (HMEC) on growth performance and carcass characteristics of finishing beef steers. The second study used feeder lambs to evaluate the effect of steam-flaking corn in a finishing diet on growth performance, carcass characteristics, and gastrointestinal tract (GIT) health. The results from the first study using steers demonstrated that feeding kernel …

Strip-Till Adoption For Soybean Production In Eastern South Dakota: Plant Development, Seed Quality, And Economic Analysis, Nicolas Passone

Electronic Theses and Dissertations

Soybean production in eastern South Dakota faces a persistent challenge: cool, wet spring conditions combined with heavy soils limit the adoption of conservation tillage despite its soil health and environmental benefits. Strip-tillage has been proposed as a middle-ground practice capable of providing conservation benefits while maintaining the seedbed quality advantages of conventional tillage. However, its performance in soybean production in South Dakota had not been evaluated prior to this work. This research examined the effects of tillage systems and fertilizer placement-timing, fertilizer rate, and seeding rate on soybean plant development, nutrient uptake, seed yield, chemical composition, and partial net economic …